Earlier quoted context omitted.
Why would the news say that app store is full of porn when you search it on Tumblr but not when you search it on Reddit? If they let at least one company do it it does seem kind of dumb.
I don't know about tumblr, but reddit doesn't allow nsfw subs out of the box on mobile, and for logged in users, you have to explicitly enable it. Obviously you can still find nsfw content on reddit that isn't labeled as such, so beyond that, it's probably up to the developer's soft skills. reddit probably has some people who are good at framing the app in communication with review, escalating review decisions, and c…
This is an Apple rule. From the App Store Review Guidelines:
> If your app includes user-generated content from a web-based service, it may display incidental mature “NSFW” content, provided that the content is hidden by default and only displayed when the user turns it on via your website.
— https://developer.apple.com/app-store/review/guidelines/#use...